So for starters I have a 2006 GMC Sierra 1500 4x4 v8 5.3L. it's my daily driver and I've had it for a little over a year with minimal issues just normal maintenance (brakes, oil changes, alternator). How ever it started over heating and leaking coolant recently. No big deal, I changed out the thermostat and water pump, that fixed the leaks as far as I can tell. But the temperature gauge will go up to the 3/4 mark and then the fans kick on and they're LOUD. It has the electric fans directly behind the radiator and not the clutch fan assembly. They're expensive to replace and I don't really want guess at this point. Just looking for some advice at what I could potentially diagnose myself without going to a garage. I should also mention the truck is not throwing any codes at this time. Any advice would be appreciated. Thanks in advance!